<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			div {
				border: solid 1px red;
				height: 50px;
			}

			#left,
			#middle,
			#right {
				float: left;
				width: 33%;
				clear: right;
			}
			#left{
				height: 100px;
			}
			
			#footer{
				clear: left;
			}
		</style>
	</head>
	<body>
		<div id="header">头部信息</div>
		<div id="left">左栏信息</div>
		<div id="middle">中栏信息</div>
		<div id="right">右栏信息</div>
		<div id="footer">脚步信息</div>
	</body>
</html>
